Wyniki wyszukiwania - BazTech

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Symulacja numeryczna przepływu czynników chłodząco-smarujących w strefie szlifowania

Kieraś Seweryn, Nadolny Krzysztof

Stal, Metale & Nowe Technologie

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2020

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nr 9-10

42--50

PL

W artykule przedstawiono krótko wybrane proekologiczne metody chłodzenia i smarowania strefy szlifowania (metodę zminimalizowanego smarowania MQL oraz chłodzenie strumieniem schłodzonego sprężonego powietrza). Opisano istotę hybrydowej metody chłodzenia i smarowania strefy szlifowania otworów, integrującej odśrodkowe podawanie aerozolu powietrzno-olejowego (MQL) przy jednoczesnym podawaniu schłodzonego sprężonego powietrza (SSP).

EN

The article presents briefly selected pro-ecological methods of cooling and lubrication of the grinding zone (minimum quantity lubrication and cooling with a stream of cooled compressed air). The essence of the hybrid method of cooling and lubrication of the grinding zone of internal cylindrical grinding process has been described, which integrates the centrifugal supply of air-oil aerosol (MQL) with a simultaneous supply of cooled compressed air. A numerical simulation model has been characterized. It was used to carry out simulation studies on the flow of cooling and lubricating agents in the grinding zone for conditions corresponding to the assumptions of the proposed hybrid method. The final part of the article presents the results of simulation tests and specifies the most favourable conditions for the application of the hybrid method of cooling and lubricating the grinding zone.

2

Możliwości zwiększenia efektywności metod chłodzenia i smarowania strefy obróbki w procesach szlifowania otworów

Nadolny Krzysztof

Stal, Metale & Nowe Technologie

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2019

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nr 11-12

69--74

PL

W artykule przedstawiono krótko funkcje mediów chłodząco-smarujących w procesach szlifowania. Opisano najistotniejsze ograniczenia w skutecznym chłodzeniu i smarowaniu strefy obróbki w procesie szlifowania walcowych powierzchni wewnętrznych (głównie otworów). Na podstawie zdefiniowanych ograniczeń scharakteryzowano wybrane innowacyjne metody zapewniające zwiększenie efektywności chłodzenia i smarowania strefy szlifowania i w efekcie umożliwiające ograniczenie ich użycia przy jednoczesnym wydłużeniu okresu trwałości narzędzi.

EN

The article briefly presents the functions of cooling lubricants in grinding processes. The most important limitations of the effective cooling and lubrication of the machining zone in the internal cylindrical grinding process are described. On the basis of the defined limitations, selected innovative methods of increasing the efficiency of the cooling and lubrication of the grinding zone are characterized. These methods enable reducing the use of coolants and at the same time extending the life of tools.

3

Effect of macro-geometry of the grinding wheel active surface on traverse internal cylindrical grinding process

Nadolny K., Kapłonek W., Ungureanu N.

Journal of Mechanical and Energy Engineering

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2017

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Vol. 1, No 1

15--22

EN

This article presents results of experimental tests of internal cylindrical traverse grinding in which the total machining allowance is removed in a single pass. Grinding wheels with zone-diversified structure made on basis of abrasive grains from Al2O3 were used in the process. Such tools are characterized by different construction of rough and finish grinding zones. Moreover, conic chamfer is shaped on their active surface that allows for even distribution of machining allowance on the grinding wheel surface. What is described in the hereby work is a device for precise shaping of conic chamfer on the grinding wheel active surface (GWAS). The work also presents results of tests whose aim was to determine the influence of grinding wheel macrogeometry on the process of internal cylindrical traverse grinding of internal cylindrical surfaces made from steel 100Cr6. Changes of selected parameters of the machined surface geometric structure (Ra, Rz, RSm, Rdq and RTp) and values of the grinding power P were analyzed. It was proved that the greater the conic chamfer width, the better the results.

4

Analiza SEM-EDS stanu czynnej powierzchni ściernicy impregnowanej węglem amorficznym po procesie szlifowania prostoliniowo-zwrotnego walcowych powierzchni wewnętrznych ze stopu Titanium Grade 2

Nadolny K., Rokosz K., Kapłonek W., Wienecke M., Heeg J.

Inżynieria Maszyn

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2015

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R. 20, z. 1

78--88

PL

W artykule dokonano szczegółowej analizy stanu ściernicy impregnowanej nowym typem impregnatu (węglem amorficznym) po procesie szlifowania prostoliniowo-zwrotnego walcowych powierzchni wewnętrznych wykonanych ze stopu Titanium Grade 2. W celu dokładnej identyfikacji śladów zużycia takiej ściernicy wywołanego szlifowaniem przeprowadzono analizy z użyciem elektronowej mikroskopii skaningowej (SEM – ang. Scanning Electron Microscopy) i spektroskopii dyspersji energii promieniowania rentgenowskiego (EDS – ang. Energy-dispersive X-ray Spectroscopy). Podczas badań eksperymentalnych zastosowano nowoczesną aparaturę obserwacyjno-pomiarową, w której skład wchodziły dwa elektronowe mikroskopy skaningowe JSM-5500LV firmy JEOL Ltd., Japonia i stacja robocza Auriga CrossBeam firmy Carl Zeiss Microscopy GmbH, Niemcy oraz zaawansowany detektor EDS Octane plus firmy EDAX, Inc., USA. Przeprowadzone analizy SEM-EDS pozwoliły na określenie udziału procentowego oraz kształtu i rozmieszczenia zalepień będących skutkiem adhezji wiórów Ti do czynnej powierzchni ściernicy oraz określenie udziału na niej substancji impregnującej (węgla amorficznego) po procesie szlifowania.

EN

In this paper, a detailed analysis of the condition of the grinding wheel impregnated with a new type of impregnate (amorphous carbon) on the reciprocal internal cylindrical grinding process of Titanium Grade 2. In order to accurately identify of wear symptoms caused on the grinding wheel during grinding process, analyzes were performed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. During the experimental research modern instruments of observation and measurement were used: two scanning electron microscopes (JSM-5500LV by JEOL Ltd., Japan and workstation Auriga CrossBeam by Carl Zeiss Microscopy GmbH, Germany) as well as advanced EDS detector (Octane plus by EDAX, Inc., USA). Conducted SEM-EDS analysis made it possible to determine the percentage, the shape and arrangement of cloggings resulting from adhesion of Ti chips to the grinding wheel active surface and to determine the share of an amorphous carbon after the grinding.

5

The effect upon the grinding wheel active surface condition when impregnating with non-metallic elements during internal cylindrical grinding of titanium

Nadolny K., Sienicki W., Wojtewicz M.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 1

71--86

EN

The following article describes the results of experimental works connected with the possibility of limiting the adhesion of grinding products to the grinding wheel active surface, as a result of introducing an impregnate, in the form of sulphur or allotropic carbon variants, into the grinding wheel volume. The methods of sulphurizing, as well as impregnation with graphite and amorphous carbon, were described. The results of experimental tests conducted in the internal cylindrical reciprocal grinding process in Titanium Grade 2® alloy, using impregnated grinding wheels, were presented and compared to the results of grinding with a non-impregnated grinding wheel. What was also determined was the influence of the type of impregnate on the grinding wheel active surface stereometric features after the grinding process, especially the degree to which smearing with machined material chips occurred. Moreover, the influence of impregnation on the machined surface roughness was also estimated. The results of the conducted experiments indicate that application of the impregnate, in the form of graphite, allowed for a 10-fold reduction in the number of smeared areas in comparison with the non-impregnated grinding wheel.

6

An analysis of centrifugal MQL supply system potential in the internal cylindrical grinding process

Nadolny K., Wojtewicz M., Sienicki W., Herman D.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 3

639--649

EN

In the article the state of knowledge regarding the functions and supply methods of the cooling liquid into the grinding zone were presented. The new system for centrifugal supply of oil mist was described. The results of experimental investigations conducted into the internal cylindrical grinding process were given. The life of the wheel, machined surface roughness, grinding power and temperature in the machining zone were analyzed. Experimental results showed that compared to flood cooling, this new system provides double the lifespan of the wheel, significantly reducing the volume of wheel wear and enabling the slightly reduced roughness of machined surface and grinding power. Using a new coolant supply method caused an increase in the workpiece temperature, compared to the flood cooling.

7

The effect of integrating the structural modifications of the grinding wheel upon the internal cylindrical grinding process

Nadolny K.

Archives of Civil and Mechanical Engineering

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2012

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Vol. 12, no. 1

60--67

EN

In this article an abbreviated presentation of the current trends in grinding development was made. It points to modifications of the grinding wheel construction as one of the most important directions in this field. The work describes in detail three selected modifications consisting of zone diversified structure, shaping microdiscontinuities of the grinding wheel active surface and applying the cooling liquid provision system inside the grinding wheel. The presented experiments were carried out in the single-pass internal cylindrical grinding process. The aim of the research was to establish the influence that the integration of certain modifications might have on the conditions and effects of the grinding process. The results obtained show that depending on the integration level, the grinding power can be decreased within the range from 31% to 56% and the surface roughness can be reduced by approximately 25%.